> A more rational approach, IMO, would create a general description set
> (probably numbering 20-50), then expanding that for more detail and for
> different materials. Users of the sets could define the "zones" they wish to
> use in an application profile, so no one would have to carry around data
> elements that they are sure they will not use. It would also provide a
> simple but compatible set for folks who don't want to do the whole "library
> description" bit.

This seems quite rational to me too.  Sounds easy enough, so you'll
have this built by the end of the week, right? :D